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Abstract
An integrated model, the Pesticide Runoff Model (PeRM), has been developed to predict pesticide losses due to runoff by considering the emission, degradation, adsorption and desorption of pesticides, as well as their movement in dissolved and adsorbed phases. The developed modeling system has been used to calculate the losses of atrazine from agricultural lands in the Kintore Creek Watershed, Ontario, Canada between 1988 and 1992. The modeling outputs have been verified against actual monitoring data, which were obtained from a water quality monitoring project carried out in the same watershed over the same period of time.
Acknowledgments
The financial support from the University of Regina and Environment Canada is highly appreciated; Special thanks to D. Li from LDC Consulting Inc. for his constant help in programming of the database and GIS; Thanks also go to A. Deptuch‐Stapf, B. Phinney, K. Puckett and S. Venkatesh of Environment Canada for their help and encouragement.